←
Old English niġon (cognate)
←
Proto-Germanic *newun (inherited)
←
Old High German niun (cognate)
←
Proto-Indo-European *h₁néwn̥ (inherited)
←
Icelandic níu (cognate)
←
Old Norse níu (inherited)
←
Old Frisian nigun (cognate)
→
Icelandic níu (cognate)
→
Norwegian Bokmål ni (cognate)